[TS Migration] Migrate Composer to TypeScript

src/components/Composer/index.android.tsx

@@ -0,0 +1,96 @@
+import React, {ForwardedRef, useCallback, useEffect, useMemo, useRef} from 'react';
+import {StyleSheet, TextInput} from 'react-native';
+import RNTextInput from '@components/RNTextInput';
+import useTheme from '@hooks/useTheme';
+import useThemeStyles from '@hooks/useThemeStyles';
+import * as ComposerUtils from '@libs/ComposerUtils';
+import {ComposerProps} from './types';
+
+function Composer(
+    {
+        shouldClear = false,
+        onClear = () => {},
+        isDisabled = false,
+        maxLines,
+        isComposerFullSize = false,
+        setIsFullComposerAvailable = () => {},
+        style,
+        autoFocus = false,
+        selection = {
+            start: 0,
+            end: 0,
+        },
+        isFullComposerAvailable = false,
+        ...props
+    }: ComposerProps,
+    ref: ForwardedRef<TextInput>,
+) {
+    const textInput = useRef<TextInput | null>(null);
+
+    const styles = useThemeStyles();
+    const theme = useTheme();
+
+    /**
+     * Set the TextInput Ref
+     */
+    const setTextInputRef = useCallback((el: TextInput) => {
+        textInput.current = el;
+        if (typeof ref !== 'function' || textInput.current === null) {
+            return;
+        }
+
+        // This callback prop is used by the parent component using the constructor to
+        // get a ref to the inner textInput element e.g. if we do
+        // <constructor ref={el => this.textInput = el} /> this will not
+        // return a ref to the component, but rather the HTML element by default
+        ref(textInput.current);
+        // eslint-disable-next-line react-hooks/exhaustive-deps
+    }, []);
+
+    useEffect(() => {
+        if (!shouldClear) {
+            return;
+        }
+        textInput.current?.clear();
+        onClear();
+    }, [shouldClear, onClear]);
+
+    /**
+     * Set maximum number of lines
+     */
+    const maxNumberOfLines = useMemo(() => {
+        if (isComposerFullSize) {
+            return 1000000;
+        }
+        return maxLines;
+    }, [isComposerFullSize, maxLines]);
+
+    const composerStyles = useMemo(() => StyleSheet.flatten(style), [style]);
+
+    return (
+        <RNTextInput
+            autoComplete="off"
+            placeholderTextColor={theme.placeholderText}
+            ref={setTextInputRef}
+            onContentSizeChange={(e) => ComposerUtils.updateNumberOfLines({maxLines, isComposerFullSize, isDisabled, setIsFullComposerAvailable}, e, styles)}
+            rejectResponderTermination={false}
+            // Setting a really high number here fixes an issue with the `maxNumberOfLines` prop on TextInput, where on Android the text input would collapse to only one line,
+            // when it should actually expand to the container (https://github.com/Expensify/App/issues/11694#issuecomment-1560520670)
+            // @Szymon20000 is working on fixing this (android-only) issue in the in the upstream PR (https://github.com/facebook/react-native/pulls?q=is%3Apr+is%3Aopen+maxNumberOfLines)
+            // TODO: remove this comment once upstream PR is merged and available in a future release
+            maxNumberOfLines={maxNumberOfLines}
+            textAlignVertical="center"
+            style={[composerStyles]}
+            autoFocus={autoFocus}
+            selection={selection}
+            isFullComposerAvailable={isFullComposerAvailable}
+            /* eslint-disable-next-line react/jsx-props-no-spreading */
+            {...props}
+            readOnly={isDisabled}
+        />
+    );
+}
+
+Composer.displayName = 'Composer';
+
+export default React.forwardRef(Composer);